Logitech Signature M650 - Mouse - optical - 5 buttons - wireless - Bluetooth, 2.4 GHz - Logitech Logi Bolt USB receiver - graphite. Upgrade to smarter scrolling, better comfort, and more productivity with the Signature M650. The versatile mouse features an adaptive scroll SmartWheel that delivers line-by-line precision, and auto-switches to super-fast free spin mode with the flick of a finger. Seamless wireless connectivity, customizable side buttons, and a comfort shape keep you comfortably and productive hour after hour. Logitech's SilentTouch technology delivers silent clicks to keep you focused - while 24-month battery life and universal operating system compatibility ensure hassle-free performance.